... 64 and 160, 150LBS-2500LBS ,5K-40K and so on .7. Sealing surface : FF ,RF, LJ, FM ,RTJ,RJ ,MALE , ... on .8. Used for : petroleum,chemical,power,gas,water,linepipe, heat exchanger,shipbuilding,construction,etc.9. Tolerance:not less than +_8% of ... wall thickness.10.Production process : raw material--cutting--heating--forging--heat treatment--maching--inspection.-washing-ex-working.11. Mill ceitificate :3 ...